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| author | Guenter Geiger <ggeiger@users.sourceforge.net> | 2004-02-02 12:18:59 +0000 |
|---|---|---|
| committer | Guenter Geiger <ggeiger@users.sourceforge.net> | 2004-02-02 12:18:59 +0000 |
| commit | 2e416ee0095f1bf608f849f156d564e0f45fb8ab (patch) | |
| tree | 9e4881e81953b434b91dbd35218d78f05b27e82e /pd/portaudio/docs/pa_impl_startstop.html | |
| parent | ae6b5d89ea93b95c2990895077cf5e8f0bba9ad9 (diff) | |
merged in version_0_37_1test6
svn path=/trunk/; revision=1305
Diffstat (limited to 'pd/portaudio/docs/pa_impl_startstop.html')
| -rw-r--r-- | pd/portaudio/docs/pa_impl_startstop.html | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/pd/portaudio/docs/pa_impl_startstop.html b/pd/portaudio/docs/pa_impl_startstop.html deleted file mode 100644 index 0f2d0ce5..00000000 --- a/pd/portaudio/docs/pa_impl_startstop.html +++ /dev/null @@ -1,190 +0,0 @@ -<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> -<html> -<head> - <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> - <meta name="GENERATOR" content="Mozilla/4.75 [en]C-gatewaynet (Win98; U) [Netscape]"> - <meta name="Author" content="Phil Burk"> - <meta name="Description" content="Internal docs. How a stream is started or stopped."> - <meta name="KeyWords" content="audio, tutorial, library, portable, open-source, DirectSound,sound, music, JSyn, synthesis,"> - <title>PortAudio Implementation - Start/Stop</title> -</head> -<body> - -<center><table COLS=1 WIDTH="100%" BGCOLOR="#FADA7A" > -<tr> -<td> -<center> -<h1> -PortAudio Implementation</h1></center> -</td> -</tr> -</table></center> - -<h2> -Starting and Stopping Streams</h2> -PortAudio is generally executed in two "threads". The foreground thread -is the application thread. The background "thread" may be implemented as -an actual thread, an interrupt handler, or a callback from a timer thread. -<p>There are three ways that PortAudio can stop a stream. In each case -we look at the sequence of events and the messages sent between the two -threads. The following variables are contained in the internalPortAudioStream. -<blockquote><tt>int past_IsActive; -/* Background is still playing. */</tt> -<br><tt>int past_StopSoon; /* Stop -when last buffer done. */</tt> -<br><tt>int past_StopNow; /* -Stop IMMEDIATELY. */</tt></blockquote> - -<h3> -Pa_AbortStream()</h3> -This function causes the background thread to terminate as soon as possible -and audio I/O to stop abruptly. -<br> -<table BORDER COLS=2 WIDTH="60%" > -<tr> -<td><b>Foreground Thread</b></td> - -<td><b>Background Thread</b></td> -</tr> - -<tr> -<td>sets <tt>StopNow</tt></td> - -<td></td> -</tr> - -<tr> -<td></td> - -<td>sees <tt>StopNow</tt>, </td> -</tr> - -<tr> -<td></td> - -<td>clears IsActive, stops thread</td> -</tr> - -<tr> -<td>waits for thread to exit</td> - -<td></td> -</tr> - -<tr> -<td>turns off audio I/O</td> - -<td></td> -</tr> -</table> - -<h3> -Pa_StopStream()</h3> -This function stops the user callback function from being called and then -waits for all audio data written to the output buffer to be played. In -a system with very low latency, you may not hear any difference between -<br> -<table BORDER COLS=2 WIDTH="60%" > -<tr> -<td><b>Foreground Thread</b></td> - -<td><b>Background Thread</b></td> -</tr> - -<tr> -<td>sets StopSoon</td> - -<td></td> -</tr> - -<tr> -<td></td> - -<td>stops calling user callback</td> -</tr> - -<tr> -<td></td> - -<td>continues until output buffer empty</td> -</tr> - -<tr> -<td></td> - -<td>clears IsActive, stops thread</td> -</tr> - -<tr> -<td>waits for thread to exit</td> - -<td></td> -</tr> - -<tr> -<td>turns off audio I/O</td> - -<td></td> -</tr> -</table> - -<h3> -User callback returns one.</h3> -If the user callback returns one then the user callback function will no -longer be called. Audio output will continue until all audio data written -to the output buffer has been played. Then the audio I/O is stopped, the -background thread terminates, and the stream becomes inactive. -<br> -<table BORDER COLS=2 WIDTH="60%" > -<tr> -<td><b>Foreground Thread</b></td> - -<td><b>Background Thread</b></td> -</tr> - -<tr> -<td></td> - -<td>callback returns 1</td> -</tr> - -<tr> -<td></td> - -<td>sets StopSoon</td> -</tr> - -<tr> -<td></td> - -<td>stops calling user callback</td> -</tr> - -<tr> -<td></td> - -<td>continues until output buffer empty</td> -</tr> - -<tr> -<td></td> - -<td>clears IsActive, stops thread</td> -</tr> - -<tr> -<td>waits for thread to exit</td> - -<td></td> -</tr> - -<tr> -<td>turns off audio I/O</td> - -<td></td> -</tr> -</table> - -<br> -</body> -</html> |